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Diagnostic System Check

  1. Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, see SCAN TOOL DOES NOT POWER UP in appropriate BODY CONTROL MODULES article.
  2. Turn ignition on, engine off. Try to establish scan tool communication with Instrument Panel Cluster (IPC), Dash Integration Module (DIM) and Powertrain Control Module (PCM). If communication with IPC, DIM and PCM is established, go to next step. If communication with IPC, DIM and PCM is not established, see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article.
  3. Select display DTC function for PCM. Record all displayed DTCs and status of displayed DTCs. If DTCs are displayed, go to next step. If no DTCs are displayed, see COOLING FAN INOPERATIVE  or COOLING FAN ALWAYS ON  .
  4. If scan tool does not display DTCs beginning with "U", go to next step. If scan tool displays DTCs beginning with "U", see SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE in appropriate BODY CONTROL MODULES article.
  5. If scan tool displays DTCs beginning with "P", see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If scan tool displays DTCs beginning with "B", see appropriate SELF-DIAGNOSTIC SYSTEM article in BODY CONTROL MODULES.
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